40401689 has 2 divisors, whose sum is σ = 40401690. Its totient is φ = 40401688.

The previous prime is 40401679. The next prime is 40401701. The reversal of 40401689 is 98610404.

40401689 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 36096064 + 4305625 = 6008^2 + 2075^2 .

It is a cyclic number.

It is not a de Polignac number, because 40401689 - 2⁸ = 40401433 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (40401659) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20200844 + 20200845.

It is an arithmetic number, because the mean of its divisors is an integer number (20200845).

Almost surely, 2^40401689 is an apocalyptic number.

It is an amenable number.

40401689 is a deficient number, since it is larger than the sum of its proper divisors (1).

40401689 is an equidigital number, since it uses as much as digits as its factorization.

40401689 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6912, while the sum is 32.

The square root of 40401689 is about 6356.2322959439. The cubic root of 40401689 is about 343.1361760145.

The spelling of 40401689 in words is "forty million, four hundred one thousand, six hundred eighty-nine".